Android Video Thumbnail Create createVideoThumbnail(String imagePath, int kind)

Description

Create a video thumbnail for a video.

Parameter

Parameter	Description
filePath	the path of video file
kind	could be MINI_KIND or MICRO_KIND

Declaration

public static Bitmap createVideoThumbnail(String imagePath, int kind) 

Method Source Code

//package com.java2s;

import android.graphics.Bitmap;

import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Rect;

import android.media.ThumbnailUtils;

import android.provider.MediaStore.Images;

public class Main {
    private static final int OPTIONS_NONE = 0x0;
    private static final int OPTIONS_SCALE_UP = 0x1;
    /**/*from  w w w .j a  v  a 2s  .c o m*/
     * Constant used to indicate we should recycle the input in
     * {@link #extractThumbnail(Bitmap, int, int, int)} unless the output is the
     * input.
     */
    public static final int OPTIONS_RECYCLE_INPUT = 0x2;
    /**
     * Constant used to indicate the dimension of micro thumbnail.
     * 
     * @hide Only used by media framework and media provider internally.
     */
    public static final int TARGET_SIZE_MICRO_THUMBNAIL = 96;

    /**
     * Create a video thumbnail for a video. May return null if the video is
     * corrupt or the format is not supported.
     * 
     * @param filePath
     *            the path of video file
     * @param kind
     *            could be MINI_KIND or MICRO_KIND
     */
    /*
    public static Bitmap createVideoThumbnail(String filePath, int kind) {
       Bitmap bitmap = null;
       MediaMetadataRetriever retriever = new MediaMetadataRetriever();
       try {
          retriever.setMode(MediaMetadataRetriever.MODE_CAPTURE_FRAME_ONLY);
          retriever.setDataSource(filePath);
          bitmap = retriever.captureFrame();
       } catch (IllegalArgumentException ex) {
          // Assume this is a corrupt video file
       } catch (RuntimeException ex) {
          // Assume this is a corrupt video file.
       } finally {
          try {
             retriever.release();
          } catch (RuntimeException ex) {
             // Ignore failures while cleaning up.
          }
       }
       if (kind == Images.Thumbnails.MICRO_KIND && bitmap != null) {
          bitmap = extractThumbnail(bitmap, TARGET_SIZE_MICRO_THUMBNAIL,
                TARGET_SIZE_MICRO_THUMBNAIL, OPTIONS_RECYCLE_INPUT);
       }
       return bitmap;
    }
     */
    public static Bitmap createVideoThumbnail(String imagePath, int kind) {
        Bitmap bitmap = null;
        bitmap = ThumbnailUtils.createVideoThumbnail(imagePath, kind);
        if (kind == Images.Thumbnails.MICRO_KIND && bitmap != null) {
            bitmap = extractThumbnail(bitmap, TARGET_SIZE_MICRO_THUMBNAIL,
                    TARGET_SIZE_MICRO_THUMBNAIL, OPTIONS_RECYCLE_INPUT);
        }
        return bitmap;
    }

    /**
     * Creates a centered bitmap of the desired size.
     * 
     * @param source
     *            original bitmap source
     * @param width
     *            targeted width
     * @param height
     *            targeted height
     */
    public static Bitmap extractThumbnail(Bitmap source, int width,
            int height) {
        return extractThumbnail(source, width, height, OPTIONS_NONE);
    }

    /**
     * Creates a centered bitmap of the desired size.
     * 
     * @param source
     *            original bitmap source
     * @param width
     *            targeted width
     * @param height
     *            targeted height
     * @param options
     *            options used during thumbnail extraction
     */
    public static Bitmap extractThumbnail(Bitmap source, int width,
            int height, int options) {
        if (source == null) {
            return null;
        }
        float scale;
        if (source.getWidth() < source.getHeight()) {
            scale = width / (float) source.getWidth();
        } else {
            scale = height / (float) source.getHeight();
        }
        Matrix matrix = new Matrix();
        matrix.setScale(scale, scale);
        Bitmap thumbnail = transform(matrix, source, width, height,
                OPTIONS_SCALE_UP | options);
        return thumbnail;
    }

    /**
     * Transform source Bitmap to targeted width and height.
     */
    private static Bitmap transform(Matrix scaler, Bitmap source,
            int targetWidth, int targetHeight, int options) {
        boolean scaleUp = (options & OPTIONS_SCALE_UP) != 0;
        boolean recycle = (options & OPTIONS_RECYCLE_INPUT) != 0;
        int deltaX = source.getWidth() - targetWidth;
        int deltaY = source.getHeight() - targetHeight;
        if (!scaleUp && (deltaX < 0 || deltaY < 0)) {
            /*
             * In this case the bitmap is smaller, at least in one dimension,
             * than the target. Transform it by placing as much of the image as
             * possible into the target and leaving the top/bottom or left/right
             * (or both) black.
             */
            Bitmap b2 = Bitmap.createBitmap(targetWidth, targetHeight,
                    Bitmap.Config.ARGB_8888);
            Canvas c = new Canvas(b2);
            int deltaXHalf = Math.max(0, deltaX / 2);
            int deltaYHalf = Math.max(0, deltaY / 2);
            Rect src = new Rect(deltaXHalf, deltaYHalf, deltaXHalf
                    + Math.min(targetWidth, source.getWidth()), deltaYHalf
                    + Math.min(targetHeight, source.getHeight()));
            int dstX = (targetWidth - src.width()) / 2;
            int dstY = (targetHeight - src.height()) / 2;
            Rect dst = new Rect(dstX, dstY, targetWidth - dstX,
                    targetHeight - dstY);
            c.drawBitmap(source, src, dst, null);
            if (recycle) {
                source.recycle();
            }
            return b2;
        }
        float bitmapWidthF = source.getWidth();
        float bitmapHeightF = source.getHeight();
        float bitmapAspect = bitmapWidthF / bitmapHeightF;
        float viewAspect = (float) targetWidth / targetHeight;
        if (bitmapAspect > viewAspect) {
            float scale = targetHeight / bitmapHeightF;
            if (scale < .9F || scale > 1F) {
                scaler.setScale(scale, scale);
            } else {
                scaler = null;
            }
        } else {
            float scale = targetWidth / bitmapWidthF;
            if (scale < .9F || scale > 1F) {
                scaler.setScale(scale, scale);
            } else {
                scaler = null;
            }
        }
        Bitmap b1;
        if (scaler != null) {
            // this is used for minithumb and crop, so we want to filter here.
            b1 = Bitmap.createBitmap(source, 0, 0, source.getWidth(),
                    source.getHeight(), scaler, true);
        } else {
            b1 = source;
        }
        if (recycle && b1 != source) {
            source.recycle();
        }
        int dx1 = Math.max(0, b1.getWidth() - targetWidth);
        int dy1 = Math.max(0, b1.getHeight() - targetHeight);
        Bitmap b2 = Bitmap.createBitmap(b1, dx1 / 2, dy1 / 2, targetWidth,
                targetHeight);
        if (b2 != b1) {
            if (recycle || b1 != source) {
                b1.recycle();
            }
        }
        return b2;
    }
}

Related

1. createVideoThumbnail(String filePath)
2. getVideoThumbnail(String videoPath, int width, int height, int kind)
3. getVideoThumbnail(String videoPath, int width, int height, int kind)
4. createVideoThumbnail(String filePath, int size)